I'm not sure whether this should be reported as a bug, but the behavior is inconsistent.
This user has 10 'Nice Answer' badges. But if you look at the answers (sorted by vote) or the details page and actually go through the answers, there are only 2 answers with 10 votes. Some of the answers are actually zero score (-1/+1), these were answers posted by the user to questions he asked. Is this a bug or is this intended behavior? And if it's intended behavior, how does it work?
And it's the same with his 'Nice Question' badge as well. Only 3 questions with >= +10 votes, but badge awarded 9 times.